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A155593 9^n+2^n-1. 17
1, 10, 84, 736, 6576, 59080, 531504, 4783096, 43046976, 387421000, 3486785424, 31381061656, 282429540576, 2541865836520, 22876792471344, 205891132127416, 1853020188917376, 16677181699797640, 150094635297261264 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

Index entries for linear recurrences with constant coefficients, signature (12,-29,18).

FORMULA

G.f.: 1/(1-9*x)+1/(1-2*x)-1/(1-x). E.g.f.: e^(9*x)+e^(2*x)-e^x.

a(n)=11*a(n-1)-18*a(n-2)-8 with a(0)=1, a(1)=10 - Vincenzo Librandi, Jul 21 2010

PROG

(PARI) a(n)=9^n+2^n-1^n \\ Charles R Greathouse IV, Jun 11 2015

CROSSREFS

Cf. A074501, A074600, A005057, A005056, A099393, A155588, A155590, A155592.

Sequence in context: A027310 A287826 A335647 * A239990 A321295 A318793

Adjacent sequences:  A155590 A155591 A155592 * A155594 A155595 A155596

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Jan 24 2009

STATUS

approved

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Last modified April 13 07:51 EDT 2021. Contains 342935 sequences. (Running on oeis4.)